Tobacco policies, such as increasing taxes and restricting smoking in public places, have been shown to reduce tobacco use among various populations. These policies are generally implemented at the state and local level with impacts seen within those jurisdictions. National-level tobacco policies, which are rare in the United States, will be implemented in three English-speaking countries (Canada, United Kingdom, and Australia) with cultural roots similar to the United States beginning in late 2002. Scientific evidence of the impact of these policy changes on smoking behavior is lacking. The purpose of this project is to collect longitudinal data from smokers in those three countries and in the United States to begin to understand the impact of national level policies on smoking behavior.